Prefetcher now tells the core when it is safe to shut down

id_stage.sv

@@ -177,6 +177,8 @@ module id_stage
   logic        jr_stall;
   logic        load_stall;
 
+  logic        halt_id;
+
 
   // Immediate decoding and sign extension
   logic [31:0] imm_i_type;

prefetch_L0_buffer.sv

@@ -68,7 +68,7 @@ module prefetch_L0_buffer
   logic               is_prefetch_q, is_prefetch_n;
 
 
-  assign busy_o = (CS != EMPTY);
+  assign busy_o = (CS != EMPTY && CS != VALID_L0) || instr_req_o;
 
 
   always_ff @(posedge clk or negedge rst_n)